feat(ui): full‑width ShadTable across app; fix rent dialog width; correct equipment pagination

- ShadTable: ensure full-width via LayoutBuilder+ConstrainedBox minWidth
- BaseListScreen: default data area padding = 0 for table edge-to-edge
- Vendor/Model/User/Company/Inventory/Zipcode: set columnSpanExtent per column
  and add final filler column to absorb remaining width; pin date/status/actions
  widths; ensure date text is single-line
- Equipment: unify card/border style; define fixed column widths + filler;
  increase checkbox column to 56px to avoid overflow
- Rent list: migrate to ShadTable.list with fixed widths + filler column
- Rent form dialog: prevent infinite width by bounding ShadProgress with
  SizedBox and remove Expanded from option rows; add safe selectedOptionBuilder
- Admin list: fix const with non-const argument in table column extents
- Services/Controller: remove hardcoded perPage=10; use BaseListController
  perPage; trust server meta (total/totalPages) in equipment pagination
- widgets/shad_table: ConstrainedBox(minWidth=viewport) so table stretches

Run: flutter analyze → 0 errors (warnings remain).

lib/screens/maintenance/maintenance_schedule_screen.dart

@@ -6,6 +6,7 @@ import '../../domain/entities/maintenance_schedule.dart';
 import 'controllers/maintenance_controller.dart';
 import 'maintenance_form_dialog.dart';
 import 'components/maintenance_calendar.dart';
+import 'package:superport/screens/common/theme_shadcn.dart';
 
 class MaintenanceScheduleScreen extends StatefulWidget {
   const MaintenanceScheduleScreen({super.key});
@@ -42,7 +43,7 @@ class _MaintenanceScheduleScreenState extends State<MaintenanceScheduleScreen>
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      backgroundColor: Colors.grey[100],
+      backgroundColor: ShadcnTheme.backgroundSecondary,
       body: Column(
         children: [
           _buildHeader(),
@@ -97,15 +98,8 @@ class _MaintenanceScheduleScreenState extends State<MaintenanceScheduleScreen>
     return Container(
       padding: const EdgeInsets.all(24),
       decoration: BoxDecoration(
-        color: Colors.white,
-        boxShadow: [
-          BoxShadow(
-            color: Colors.grey.withValues(alpha: 0.1),
-            spreadRadius: 1,
-            blurRadius: 3,
-            offset: const Offset(0, 2),
-          ),
-        ],
+        color: ShadcnTheme.card,
+        boxShadow: ShadcnTheme.shadowSm,
       ),
       child: Column(
         children: [
@@ -128,9 +122,7 @@ class _MaintenanceScheduleScreenState extends State<MaintenanceScheduleScreen>
                         '총 ${controller.totalCount}건 | '
                         '예정 ${controller.upcomingCount}건 | '
                         '지연 ${controller.overdueCount}건',
-                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                          color: Colors.grey[600],
-                        ),
+                        style: ShadcnTheme.bodySmall.copyWith(color: ShadcnTheme.mutedForeground),
                       );
                     },
                   ),
@@ -183,8 +175,8 @@ class _MaintenanceScheduleScreenState extends State<MaintenanceScheduleScreen>
     return Container(
       padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
       decoration: BoxDecoration(
-        color: Colors.white,
-        border: Border(bottom: BorderSide(color: Colors.grey[300]!)),
+        color: ShadcnTheme.card,
+        border: Border(bottom: BorderSide(color: ShadcnTheme.border)),
       ),
       child: Row(
         children: [
@@ -201,7 +193,7 @@ class _MaintenanceScheduleScreenState extends State<MaintenanceScheduleScreen>
             child: Container(
               padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
               decoration: BoxDecoration(
-                border: Border.all(color: Colors.grey[300]!),
+                border: Border.all(color: ShadcnTheme.border),
                 borderRadius: BorderRadius.circular(8),
               ),
               child: Row(
@@ -464,7 +456,7 @@ class _MaintenanceScheduleScreenState extends State<MaintenanceScheduleScreen>
     return Chip(
       label: Text(
         '${alert.daysUntilDue < 0 ? "지연 " : ""}${alert.daysUntilDue.abs()}일',
-        style: TextStyle(fontSize: 12, color: Colors.white),
+        style: TextStyle(fontSize: 12, color: ShadcnTheme.primaryForeground),
       ),
       backgroundColor: color,
       padding: const EdgeInsets.symmetric(horizontal: 8),